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Degrowth and prisoner's dilemma
(reddthat.com)
Environmental and ecological discussion, particularly of things like weather and other natural phenomena (especially if they're not breaking news).
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Address the population issue.
The most probable is war, disease, famine, instability, collapse, along with large migrations of people. This is likely plan A.
A global one child policy is another approach along with true costing of carbon and other depletion activities. Even better a true change in what people think. Women's rights, education, and opportunity goes a long way as does birth control and abortion rights. I am not an optimist here.